Display driving device with crosstalk compensation and display device including the same

Abstract

A display driving device includes a pixel column grayscale characteristic value calculation unit, a pixel crosstalk compensation unit and a driving unit. The pixel column grayscale characteristic value calculation unit calculates a pixel column grayscale characteristic value of each pixel column of a display frame, wherein the pixel column grayscale characteristic value is the sum of the pixel grayscale characteristic values ​​of all display pixels of the corresponding pixel column; the pixel crosstalk compensation unit compensates each display pixel of the corresponding pixel column with a pixel compensation value of each pixel column, wherein the pixel compensation value of each pixel column is generated based on the comparison of the pixel column grayscale characteristic value of the pixel column with a preset plurality of pixel column grayscale characteristic thresholds; and the driving unit drives the display panel with the compensated display pixels of the display frame.

Description

Technical Field

[0001] The present invention relates to the technical field of display driving, and in particular to a display driving device with crosstalk compensation and a display device comprising the same. Background Art

[0002] For example, the brightness of a flat display panel such as an organic light emitting diode (OLED) panel is often affected by the adjacent area of ​​the screen, resulting in uneven brightness of the screen, especially the extension line of the black-white boundary. This is caused by the crosstalk phenomenon caused by coupling and mutual interference between signals.

[0003] Figure 1 A display frame is shown to illustrate the crosstalk phenomenon. As shown in the figure, the display frame has a black block. When driven to the display scan line S(x-1), since the image is white, the voltage of the display data line D(a) is low (L). When driven to the display scan line S(x), since the image displays a black block, the voltage of the display data line D(a) changes from low (L) to high (H). When driven to the display scan line S(x+1), the image displays a black block, so the voltage of the display data line D(a) is high (H). Since the voltage of the display data line D(a) changes from low (L) to high (H), it affects the operating voltage (ELVDD) of the pixel units in the same row of the display panel, resulting in a rising surge in the operating voltage.

[0004] Furthermore, when driven to the display scan line S(y), the screen still displays a black area, so the voltage of the display data line D(a) is a high potential (H), and when driven to the display scan line S(y+1), since the screen is white, the voltage of the display data line D(a) changes from a high potential (H) to a low potential (L), and when driven to the display scan line S(y+2), the screen is white, so the voltage of the display data line D(a) is a low potential (L). Since the voltage of the display data line D(a) changes from a high potential (H) to a low potential (L), it will affect the operating voltage (ELVDD) of the pixel units in the same row of the display panel, resulting in a drop surge in the operating voltage.

[0005] Therefore, for Figure 1 As for the display data line D(b) shown in the figure, since the working voltage of the pixel column corresponding to the display scan lines S(x) and S(y+1) will be disturbed and generate rising surges and falling surges, it will also affect the display of the display data line D(b), causing the display panel to have uneven brightness.

[0006] In order to solve the problem of uneven brightness of the display panel caused by the above-mentioned crosstalk, a direct solution is to compensate the voltage of the display data line according to the sudden change of the working voltage of the pixel column. For example, the voltage of the display data line D(b) is changed according to the sudden change of the working voltage. However, this compensation method is affected by time delay and cannot correctly compensate the voltage of the display data line, and cannot meet actual needs.

[0007] Therefore, there are still many deficiencies in the design of crosstalk compensation of the conventional display panel and there is a need for improvement. Summary of the invention

[0008] The main purpose of the present invention is to provide a display driver device with crosstalk compensation and a display device including the same, which uses an algorithm to analyze the image content of the display frame to calculate the pixel row grayscale characteristic value of each pixel row, and then obtains the pixel row compensation value of each display pixel by comparing the pixel row grayscale characteristic threshold, and performs compensation accordingly to effectively reduce the impact of crosstalk.

[0009] According to one feature of the present invention, a display driving device is provided for driving a display panel to display a display frame on the display panel, wherein the display frame has a plurality of pixel columns, each pixel column has a plurality of display pixels, and the pixel value of each display pixel includes at least one color value. The display driving device comprises: a pixel column grayscale characteristic value calculation unit, for calculating a pixel column grayscale characteristic value of each pixel column of the display frame, wherein the pixel column grayscale characteristic value is the sum of the pixel grayscale characteristic values ​​of all display pixels of the corresponding pixel column, and the pixel grayscale characteristic value of each display pixel is calculated according to the display A pixel color integration value of a pixel is generated by comparing it with a plurality of preset pixel grayscale characteristic thresholds, and the pixel color integration value of each display pixel is based on the sum of pixel values ​​of all colors of the display pixel multiplied by corresponding weights; a pixel crosstalk compensation unit compensates each display pixel of the corresponding pixel column with a pixel compensation value of each pixel column, wherein the pixel compensation value of each pixel column is generated by comparing the pixel column grayscale characteristic value of the pixel column with a plurality of preset pixel column grayscale characteristic thresholds; and a driving unit drives the display panel with the compensated display pixels of the display frame.

[0010] According to another feature of the present invention, a display device is provided, comprising: a display panel; and a display driving device, driving the display panel to display a display frame on the display panel, wherein the display frame has a plurality of pixel columns, each pixel column has a plurality of display pixels, and the pixel value of each display pixel includes at least one color value, and the display driving device comprises: a pixel column grayscale characteristic value calculation unit, for calculating a pixel column grayscale characteristic value of each pixel column of the display frame, wherein the pixel column grayscale characteristic value is the sum of the pixel grayscale characteristic values ​​of all display pixels of the corresponding pixel column, and the pixel grayscale characteristic value of each display pixel is The value is generated based on the comparison of the pixel color integration value of the display pixel with a plurality of preset pixel grayscale characteristic thresholds, and the pixel color integration value of each display pixel is based on the sum of the pixel values ​​of all colors of the display pixel multiplied by the corresponding weights; a pixel crosstalk compensation unit, which compensates each display pixel of the corresponding pixel column with a pixel compensation value of each pixel column, wherein the pixel compensation value of each pixel column is generated based on the comparison of the pixel column grayscale characteristic value of the pixel column with a plurality of preset pixel column grayscale characteristic thresholds; and a driving unit, which drives the display panel with the compensated display pixels of the display frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A display frame is shown to illustrate the crosstalk phenomenon.

[0012] Figure 2 A schematic diagram showing a display device of the present invention.

[0013] Figure 3 The following is an example of the operation of the pixel row grayscale characteristic value calculation unit according to the present invention.

[0014] Figure 4 An operation example of the pixel crosstalk compensation unit according to the present invention is shown.

[0015] Figure 5 A test example of crosstalk compensation according to the present invention is shown.

[0016] Figure 6 Another test example of crosstalk compensation according to the present invention is shown.

[0017] Display panel 10

[0018] Display driving device 20

[0019] Drive unit 21

[0020] Pixel column grayscale characteristic value calculation unit 23

[0021] Pixel crosstalk compensation unit 25

[0022] Display frame 30

[0023] Pixel column 31

[0024] Display Pixels 311 DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the implementation of the present invention and are not intended to limit the present invention.

[0026] Figure 2 The schematic diagram of the display device of the present invention includes a display panel 10 and a display driving device 20 . The display driving device 20 has a driving unit 21 , a pixel row grayscale characteristic value calculation unit 23 , and a pixel crosstalk compensation unit 25 . The display driving device 20 is used to drive the display panel 10 to display a display frame 30 on the display panel 10. The display frame 30 has a plurality of pixel rows 31. Each pixel row 31 has a plurality of display pixels 311. Each display pixel 311 includes at least one display sub-pixel of a specific color. That is, the pixel value of each display pixel 311 includes at least one color value. In one embodiment and the following description of the present invention, each display pixel 311 of the display frame 30 includes a red display sub-pixel, a green display sub-pixel and a blue display sub-pixel. That is, the pixel value of each display pixel 311 includes a red color value (R), a green color value (G) and a blue color value (B). In other embodiments, the display sub-pixels in the display pixels 311 may also be a combination of different colors. Therefore, the present invention is not limited to the combination of the colors of the display sub-pixels.

[0027] The aforementioned pixel row grayscale characteristic value calculation unit 23 is used to calculate a pixel row grayscale characteristic value K of each pixel row 31 of the display frame 30. The pixel row grayscale characteristic value K is the sum of the pixel grayscale characteristic values ​​q of all display pixels 311 corresponding to the pixel row 31, and the pixel grayscale characteristic value q of each display pixel 311 is a value generated by comparing the pixel color integration value v of the display pixel 311 with a plurality of preset pixel grayscale characteristic thresholds th, wherein the pixel color integration value v of each display pixel 311 is the sum of the pixel values ​​(R / G / B) of all colors of the display pixel 311 multiplied by the corresponding weights.

[0028] The values of the aforementioned multiple pixel gray-scale characteristic thresholds th are integers greater than 0 and increase sequentially. Therefore, multiple numerical ranges can be defined among the values greater than 0. The multiple numerical ranges respectively correspond to multiple preset pixel gray-scale characteristic values q', and the multiple preset pixel gray-scale characteristic values q' decrease sequentially, for example, decreasing sequentially to 0. Therefore, according to which numerical range the pixel color integration value v is in, the pixel gray-scale characteristic value q of the display pixel 311 can be obtained as the preset pixel gray-scale characteristic value q' corresponding to this numerical range.

[0029] Please refer to Figure 3 As shown in the operation example of the pixel column gray-scale characteristic value calculation unit 23 according to the present invention, the pixel value (R / G / B) of a display pixel 311 in a pixel column 31 has a red color value R, a green color value G, and a blue color value B. The weights corresponding to the red color value R, the green color value G, and the blue color value B are wr, wg, and wb respectively, where the weights wr, wg, and wb are respectively values between 0 and 1. For example, wr = 1 / 4, wg = 1 / 2, wb = 1 / 4. Accordingly, the pixel color integration value v of the display pixel 311 is wr×R + wg×G + wb×B. Another example is Figure 3 As shown in the example of, the multiple pixel gray-scale characteristic thresholds th include three pixel gray-scale characteristic thresholds th1, th2, th3, where 0 < th1 < th2 < th3. Therefore, four numerical ranges vs1, vs2, vs3, vs4 can be defined among the values greater than 0. These numerical ranges vs1, vs2, vs3, vs4 respectively correspond to four preset pixel gray-scale characteristic values q1, q2, q3, q4, where q1 > q2 > q3 > q4 = 0. Therefore, according to the numerical range where the pixel color integration value v is located, for example, the numerical range vs2 (that is, v is between th1 and th2), the pixel gray-scale characteristic value q of the display pixel 311 can be obtained as the preset pixel gray-scale characteristic value q2 corresponding to the numerical range vs2.

[0030] In the above manner, the pixel gray-scale characteristic values q of each display pixel 311 in a pixel column 31 can be obtained. Then, by summing up the pixel gray-scale characteristic values q of all the display pixels 311 in the pixel column 31, the pixel column gray-scale characteristic value K of each pixel column 31 can be calculated.

[0031] Please refer to again Figure 2, the aforementioned pixel crosstalk compensation unit 25 compensates each display pixel 311 of the corresponding pixel column 31 with a pixel compensation value comp of each pixel column 31 to eliminate the influence of crosstalk. The pixel compensation value comp of each pixel column 31 is a value generated by comparing the pixel column gray scale characteristic value K of the pixel column 31 with a preset plurality of pixel column gray scale characteristic thresholds TH. Among them, the values of the aforementioned plurality of pixel column gray scale characteristic thresholds TH are integers greater than 0 and increase in sequence. Therefore, a plurality of numerical ranges can be defined among the values greater than 0. The plurality of numerical ranges respectively correspond to a plurality of preset pixel compensation values comp’, and the plurality of preset pixel compensation values comp’ increase in sequence, for example, increase in sequence from 0. Therefore, according to which numerical range the pixel column gray scale characteristic value K is located in, the pixel compensation value comp of the display pixel 311 of the corresponding pixel column 31 can be obtained as the preset pixel compensation value comp’ corresponding to this numerical range.

[0032] Please refer to Figure 4 The following shows an operation example of the pixel crosstalk compensation unit 25 according to the present invention. It shows that a pixel column 31 has a pixel column gray scale characteristic value K, and a display pixel 311 of the pixel column 31 has a display pixel value (R, G, B). The plurality of pixel column gray scale characteristic thresholds TH include three pixel column gray scale characteristic thresholds TH1, TH2, TH3. Among them, 0 < TH1 < TH2 < TH3. Therefore, four numerical ranges VS1, VS2, VS3, VS4 can be defined among the values greater than 0. These numerical ranges VS1, VS2, VS3, VS4 respectively correspond to four preset pixel column compensation values comp1, comp2, comp3, comp4. Among them, 0 = comp1 ≤ comp2 ≤ comp3 ≤ comp4. Therefore, according to the numerical range where the pixel column gray scale characteristic value K of the pixel column 31 to which the display pixel 311 belongs is located, for example, it is the numerical range VS2 (that is, K is between TH1 and TH2), the pixel compensation value comp of the display pixel 311 can be obtained as the preset pixel compensation value comp2 corresponding to the numerical range VS2. Accordingly, the pixel crosstalk compensation unit 25 compensates the pixel value (R / G / B) of the display pixel 311 with this pixel compensation value comp. The compensated pixel value (R’ / G’ / B’) is:

[0033] R’ = R - comp = R - comp2,

[0034] G’ = G - comp = G - comp2,

[0035] B’ = B - comp = B - comp2,

[0036] In this way, each display pixel 311 of each pixel column 31 of the display frame 30 can be compensated, so that the driving unit 21 can drive the display panel 10 with the compensated display pixels 311 of the display frame 30 to display correctly without being affected by crosstalk.

[0037] Figure 5 The figure shows a test example of crosstalk compensation according to the present invention, wherein the display frame 30 has white areas A, B, C and black areas D1, D2, the white area B is located between the black areas D1, D2 and needs to be compensated, the pixel values ​​of the white areas A, B, C are (255, 255, 255), and the pixel values ​​of the black areas D1, D2 are (0, 0, 0), and after the crosstalk compensation of the present invention, the compensated pixel values ​​of the white area B are (254, 254, 254).

[0038] Figure 6 FIG. 2 is another test example of crosstalk compensation according to the present invention, in which white areas A, X, B, C, D, E, F, G, H, I, and J that need to be compensated are marked. Since the black area adjacent to the white area X is smaller, the calculated pixel compensation value comp of the white area X is 0, so the white area X will not be compensated. Among the areas that need to be compensated, the original pixel value of the white area A is (255, 255, 255), and the pixel value after compensation is (253, 253, 253); the original pixel value of the white area B is (255, 255, 255), and the pixel value after compensation is (253, 253, 253); the original pixel value of the white area C is (255, 255, 255), and the pixel value after compensation is (254, 254, 254); the original pixel value of the white area D is (255, 255, 255), and the pixel value after compensation is (255, 255, 255). The original pixel value of the white area E is (255,255,255), and the pixel value after compensation is (253,253,253); the original pixel value of the white area F is (255,255,255), and the pixel value after compensation is (253,253,253); the original pixel value of the white area G is (255,255,255), and the pixel value after compensation is (254,2 54,254); the original pixel value of the white area H is (255,255,255), and the pixel value after compensation is (253,253,253); the original pixel value of the white area I is (255,255,255), and the pixel value after compensation is (254,254,254); the original pixel value of the white area J is (255,255,255), and the pixel value after compensation is (254,254,254).

[0039] From the above description, it can be seen that the present invention utilizes an algorithm to analyze the image content of the display frame to calculate the pixel row grayscale characteristic value of each pixel row, and then obtains the pixel row compensation value of each display pixel by comparing the pixel row grayscale characteristic threshold. Accordingly, by changing the pixel value of the display frame, the crosstalk phenomenon can be effectively improved and reduced.

[0040] The above embodiments are merely examples for the convenience of description. The scope of rights claimed by the present invention should be based on the claims, but not limited to the above embodiments.

Claims

1. A display driving device for driving a display panel to display a display frame on the display panel, wherein the display frame has a plurality of pixel rows, each pixel row has a plurality of display pixels, and the pixel value of each display pixel includes at least one color value, wherein: The display driving device comprises: a pixel row grayscale characteristic value calculation unit, used for calculating a pixel row grayscale characteristic value of each pixel row of the display frame, wherein the pixel row grayscale characteristic value is the sum of the pixel grayscale characteristic values ​​of all display pixels of the corresponding pixel row, the pixel grayscale characteristic value of each display pixel is generated according to the comparison between the pixel color integration value of the display pixel and a plurality of preset pixel grayscale characteristic thresholds, and the pixel color integration value of each display pixel is the sum of the pixel values ​​of all colors of the display pixel multiplied by the corresponding weights; a pixel crosstalk compensation unit, which compensates each display pixel of the corresponding pixel row with a pixel compensation value of each pixel row, wherein the pixel compensation value of each pixel row is generated according to the comparison between the pixel row grayscale characteristic value of the pixel row and a plurality of preset pixel row grayscale characteristic thresholds; and A driving unit drives the display panel with the compensated display pixels of the display frame.

2. The display driving device according to claim 1, wherein: The values ​​of the plurality of pixel grayscale characteristic thresholds are integers greater than 0 and increase in sequence, so as to define a plurality of value ranges in the value greater than 0 corresponding to a plurality of preset pixel grayscale characteristic values, and the plurality of preset pixel grayscale characteristic values ​​decrease in sequence.

3. The display driving device according to claim 2, wherein: The pixel grayscale characteristic value of the display pixel is a preset pixel grayscale characteristic value corresponding to the numerical range of the pixel color integration value of the display pixel.

4. The display driving device according to claim 2, wherein: The plurality of preset pixel grayscale characteristic values ​​decrease to 0 in sequence.

5. The display driving device according to claim 1, wherein: The pixel value of each display pixel has a red color value, a green color value, and a blue color value. The pixel color integration value of each display pixel is: v=wr×R+wg×G+wb×B, Among them, v represents the pixel color integration value, R represents the red color value, G represents the green color value, B represents the blue color value, and wr, wg and wb are weights between 0 and 1 respectively.

6. The display driving device according to claim 1, wherein: The values ​​of the plurality of pixel column grayscale characteristic thresholds are integers greater than 0 and increase in sequence, so as to define a plurality of value ranges in the value greater than 0 corresponding to a plurality of preset pixel compensation values, and the plurality of preset pixel compensation values ​​increase in sequence.

7. The display driving device according to claim 6, wherein: The pixel compensation value of the display pixel is a preset pixel compensation value corresponding to a numerical range of the pixel column grayscale characteristic value of the pixel column to which the display pixel belongs.

8. The display driving device according to claim 6, wherein: The plurality of preset pixel compensation values ​​increase in sequence from 0.

9. The display driving device according to claim 7, characterized in that: The pixel value of each display pixel has a red color value, a green color value, and a blue color value. The pixel crosstalk compensation unit compensates the pixel value of the display pixel with the pixel compensation value as follows: R'=R-comp, G'=G-comp, B'=B-comp, Among them, R represents the red color value before compensation, G represents the green color value before compensation, B represents the blue color value before compensation, R' represents the red color value after compensation, G' represents the green color value after compensation, B' represents the blue color value after compensation, and comp represents the pixel compensation value.

10. A display device, comprising: a display panel; as well as A display driving device drives the display panel to display a display frame on the display panel, wherein the display frame has a plurality of pixel rows, each pixel row has a plurality of display pixels, and the pixel value of each display pixel includes at least one color value, wherein the display driving device comprises: a pixel row grayscale characteristic value calculation unit, used for calculating a pixel row grayscale characteristic value of each pixel row of the display frame, wherein the pixel row grayscale characteristic value is the sum of the pixel grayscale characteristic values ​​of all display pixels of the corresponding pixel row, the pixel grayscale characteristic value of each display pixel is generated according to the comparison between the pixel color integration value of the display pixel and a plurality of preset pixel grayscale characteristic thresholds, and the pixel color integration value of each display pixel is the sum of the pixel values ​​of all colors of the display pixel multiplied by the corresponding weights; a pixel crosstalk compensation unit, which compensates each display pixel of the corresponding pixel row with a pixel compensation value of each pixel row, wherein the pixel compensation value of each pixel row is generated according to the comparison between the pixel row grayscale characteristic value of the pixel row and a plurality of preset pixel row grayscale characteristic thresholds; and A driving unit drives the display panel with the compensated display pixels of the display frame.

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